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x in (-oo:+oo)
y = (3/8)*x+6 // - (3/8)*x+6
y-((3/8)*x)-6 = 0
(-3/8)*x+y-6 = 0
y-3/8*x-6 = 0 // - y-6
-3/8*x = -(y-6) // : -3/8
x = (-(y-6))/(-3/8)
x = -8/3*(6-y)
x = -8/3*(6-y)
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